Cu-g-C_3N_4/WO_3可见光下降解四环素的性能研究  

Study on Degradation of Tetracycline Hydrochloride Using Cu-g-C_3N_4/WO_3 Photocatalyst under Visible Light

作　　者：张黎明[1] 吴磊[1] 邵云[1] 李莲 ZHANG Li-ming;WU Lei;SHAO Yun;LI Lian(School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《人工晶体学报》2018年第6期1128-1135,共8页Journal of Synthetic Crystals

基　　金：十三五国家专项课题(2017ZX07202004-005)

摘　　要：以尿素、氯化铜和偏钨酸铵为原料制备了Cu-g-C_3N_4/WO_3新型异质结构催化剂,降解水体中盐酸四环素污染物。对制备的催化剂进行了XRD、SEM、UV-Vis、PL表征,从晶型结构、表面形貌、光电性能方面分析改性g-C_3N_4降解效果提高的原因。此外,以LED灯模拟可见光源,考察了不同WO_3复合量、催化剂投加量、污染物初始浓度及溶液pH对盐酸四环素降解效果的影响,并探究了降解反应机理。结果表明WO_3与Cu-g-C_3N_4进行了简单物理复合,Cu-g-C_3N_4包裹在WO_3表面并形成Z型异质结构,影响了g-C_3N_4的能带结构,增强了可见光的吸收,降低了电子-空穴对的复合。当mWO_3∶mCu-g-C_3N_4=5%,pH=5时降解效果最佳,此外催化剂投加量越高、盐酸四环素浓度越低,降解效果越好,反应过程中主要活性基团为空穴、·O-2和·OH。A novel Cu-g-C3N4/WO3 heterostructure photocatalyst was fabricated using urea,cupric chloride and ammonium metatungstate as raw materials to degrade tetracycline hydrochloride pollutant in water environment. The XRD,SEM,UV-Vis and PL of different catalyst samples were characterized to analysis the reasons of improved degradation from crystal structure,surface morphology and photoelectric properties. In addition,using LED light as simulated visible light source,the research investigated the effects of different WO3 contents,dosage of catalyst,initial concentration of pollutants and solution pH on the degradation of tetracycline hydrochloride and its degradation mechanism. The results showed that WO3 and Cu-g-C3N4 were simply physically compounded. Cu-g-C3N4 was coated on the surface of WO3 and formed a Z-type heterostructure,which affected the band structure of g-C3N4,enhanced the absorption of visible light and supressed the electron-hole pair＇s recombination. when m WO3∶ mCu-g-C3N4= 5% and pH = 5,the tetracycline hydrochloride displayed the best photocatalytic efficiency. Moreover,the higher dosage of the catalyst and the lower tetracycline hydrochloride concentration,the better degradation activity. The main active groups during the reaction are holes,·O-2 and·OH.

关 键 词：WO3 Cu-g-C3N4 光催化 四环素 

分 类 号：O643.36[理学—物理化学]